| 摘要 |
PROBLEM TO BE SOLVED: To provide a transition critical refrigerant cycle device whose high pressure side has supercritical pressure and which prevents damage to a compressor due to liquid compression to improve cooling capacity in an evaporator without providing a receiver tank on a low pressure side. SOLUTION: This transition critical refrigerant cycle device is provided with an intermediate cooling circuit 150, an oil separator 170, an oil return circuit 175, a first internal heat exchanger 160 performing heat exchange between refrigerant from a second rotary compression element coming out of a gas cooler and refrigerant coming out of the evaporator 157, and a second internal heat exchanger 162 performing heat exchange between oil flowing in the oil return circuit and refrigerant from the evaporator coming out of the first internal heat exchanger. An expansion mechanism 156 is composed of a first expansion valve 156A and a second expansion valve 156B provided on the downstream side of the first expansion valve 156A. It is provided with an injection circuit 210 injecting a part of refrigerant flowing between the first and second expansion valves 156A and 156B into a suction side of the second rotary compression element. COPYRIGHT: (C)2004,JPO
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